Kylie Jenner may sometimes argue with her sisters, but when it comes to their brother Rob Kardashian’s new romance with Blac Chyna, Kylie is united with the rest of the Keeping Up with the Kardashians clan in going against the relationship. And for Jenner, it’s especially difficult because Chyna is the ex of Kylie’s boyfriend Tyga, reported E! News.

The hook-up between their 28-year-old brother and his 27-year-old model gal pal has infuriated Jenner and sister Kim Kardashian, as well as the other sisters, an insider told E! Online.

Kendall Jenner, Kim Kardashian, and Kylie Jenner are united against Rob’s new romance. [Photo by Larry Busacca/Getty Images for MTV]

“[The] sisters are livid about their relationship and not supportive of it at all,” revealed the source.

The complicated history includes Chyna’s past engagement to Tyga, with whom she has a son, and some shade thrown back and forth. And a second source revealed to E! that the Keeping Up with the Kardashians crew view their brother’s decision to date Chyna as betraying them and showing a lack of loyalty.

“All the sisters are united and think Rob is being disloyal,” a second source close to the family revealed to E! News. “They want him to be happy, but they’re just so over the whole thing.”

Not only does Kim feel that the relationship is wrong in so many ways, but Kardashian is already over it.

“She doesn’t even care,” added the insider.

When Kylie learned that Rob’s new girlfriend had been arrested for public intoxication and possessing a controlled substance in Texas on January 28, Jenner was not shocked, a source told Hollywood Life.

“When Kylie heard about Blac’s arrest, she wasn’t surprised in the slightest,” revealed the source. “She knows she’s trouble and thinks that’s just the kind of behavior she’s capable of because she brings drama everywhere she goes.”

Not shocked: Kylie Jenner wasn’t surprised about the negative PR surrounding her brother’s new gal pal arrest. [Photo by Astrid Stawiarz/Getty Images for NYFW: The Shows]

Amidst all the drama, Kylie and Tyga have sought to stay together, with Jenner joining her boyfriend on a recent date night and excursion to Disneyland, reported the Daily Mail.

Tyga and Kylie enjoyed a dinner date at Los Angeles’ Nobu over the weekend, following time together during the week. Jenner, 18, and her 26-year-old rapper boyfriend also went to Disneyland with some pals. The group included birthday girl Jordyn Woods and Justine Skye.

Retreating to the Disneyland Resort, Kylie and Tyga had fun with a friend’s little sister, shared Jenner on social media. But the Happiest Place On Earth proved just as much fun for Kylie and her friends as the younger member of their group, reported E! News.

“Took Jordyns little sis to Disney last minute because she said she’d never been.I think we had more fun than her @jordynwoods @justineskye,” posted Kylie.

Jenner made it clear that she was enjoying herself, from prancing around to the tunes of Disney’s Paint the Night parade and subjecting herself to the splashdown of Splash Mountain. It proved a welcome reprieve from the drama going on at home.

And when Kylie headed back to work on her Lip Kit, she had a pal to keep up her courage.

A photo posted by King Kylie (@kyliejenner) on Jan 30, 2016 at 1:08pm PST

“Bring your puppy to work day @lipkitbykylie,” wrote Jenner of her caption for the cute photo.

Amid all the drama, Kylie also seems to be taking some cues from her sister Kendall Jenner when it comes to posing prettily, according to Us Weekly.

Flaunting her figure in a black sweater, black socks, and black Moschino underwear, Jenner posed on her couch in her mansion worth $2.7 million, located in Calabasas, California.

The pose comes as Kendall takes off everything but her undies for a new Calvin Kelin campaign. But fans of Kylie should enjoy her social media shots now, because Jenner shared that after she has her first baby, she’ll vanish from Instagram.

“Once I have a kid, I’m not going to be on Instagram,” declared Kylie. “You know, I’ll probably delete my Instagram and just… I don’t know, live life.”

But life has its heartbreaks. A sneak peek of an upcoming episode of Keeping Up with the Kardashians reveals Jenner breaking down in tears over Tyga, reported the Mirror.

“I just, like, don’t know what to do about T,” weeps Kylie.

The preview did not reveal the specifics, but Tyga allegedly cheated on Jenner in 2015 with a 23-year-old model, who claims Tyga slept with her while Kylie was elsewhere, causing a shocker for the teen and her hopes for romance.